% Figure 6

axoptions={'scaled ticks = false',...
           'y tick label style={/pgf/number format/.cd, fixed, fixed zerofill,precision=1, set thousands separator={}}',...
           'x tick label style={/pgf/number format/.cd, fixed, fixed zerofill,precision=0, set thousands separator={}}',...
           'legend style={font=\normalsize}'}; %\scriptsize
figure
plot(1974:2017,sig25,'LineWidth',2);hold on 
plot(1974:2017,sig50,'LineWidth',2);hold on 
plot(1974:2017,sig75,'LineWidth',2);hold on 
legend('25th percentile','50th percentile','75th percentile',Location='southeast')
ylabel('The value of $\sigma$','interpreter','latex')
%matlab2tikz('../fig/Sigma_OLS.tex','extraAxisOptions',axoptions);
  